SU157215A1 - - Google Patents

Description

Installations are known for forming a fibrous web, for example, on a moving endless mesh, including a mass-forming forming and squeezing device.

Limiting the speed and performance of known vacuum forming units is associated with the complexity of the process of forming a uniform layer at elevated speeds.

The proposed installation allows to intensify the process of draining the web and reduce the dimensions of the grid part.

This is achieved by performing a squeezing device in the form of a series of shafts installed in an inclined plane, arranged in pairs one above the other, of which the lower ones are suction and the upper ones are clamped and connected to pneumo-membranes and levers; and on both sides of the blade between the upper shafts, water schabers are installed, and between the lower ones - slot-hole suckers.

FIG. 1 schematically depicts a web forming apparatus, a general view; in fig. 2 is the same; the section along A-A in FIG. one; in fig. 3 is a diagram of the installation of the shafts on the squeezing device.

The plant for forming a web of fibrous mass is made of a mass-filling device 1, a forming device 2 and a squeezing one, including upper pressing 3 and lower 4 suction shafts installed in an inclined plane.

The upper clamping shafts are connected with pneumo-membranes 5 and levers 6. Between the upper clamping shafts 5 above the moldable no.

Lot 7, water scrapers 8 are installed, and slot-hole suckers 9 are located between the lower shafts.

A mass with a concentration of, for example, 1% is put into the mass-filling device 1, in which a certain level is maintained by means of an overflow wall W. The amount of mass supplied to the forming unit 2 is governed by its level in the inlet device /, the opening value of the mass-opening slit and concentration.

The molding device 2 is divided into five sections. In the first two sections, a vacuum is created by a barometric siphon pipe 12, since there is no air suction through the mass layer, and water from the drain pipes 13 is continuously supplied from the ends, preventing the penetration of outside air from the edge of the grid 14. The subsequent sections are connected to a vacuum seal system 15. Dehydration is carried out until the water disappears on the surface of the web, which corresponds to the beginning of the suction of air through the wet web. The bay mirror should be in the middle of the last grid. The vacuum in the suction sections is regulated in the range from 100 to 300 mm Hg. Art. Such a large vacuum does not increase the wear of the mesh 14, since the sections are in contact with the rubberized aperture tape 16. The water level in the suction section is adjusted by means of the valve 17.

Further dewatering of the web 7 is performed by passing it along with the grid 14 between the shafts. The pressed water is removed by the suction chamber 18, the lower suction rolls 4 and the water scrapers 8. The water left in the cells of the grid 14 is removed by slotted sucks 9.

At the end of the squeezing device, a caster shaft 19 and a removable rubberized roller 20 are installed.

The upper clamping shafts 3 — rubber-grooved, corrugated — are pressed against the lower suction rolls 4 by means of a pneumatic membrane 5 and levers 6 (Fig. 3). All shafts are mounted on grid beams 21 and pillars 22 (Fig. 3).

The number of pairs of shafts may vary depending on the amount of water that has been removed. After the couch shaft 19, the pins are directed to the press section of the plant (not shown). Grid 14 rounds up the mesh-carrying roller 23, the tensioning .24 and the correct 25 around the return stroke.

Subject invention

A plant for shaping a web of fibrous mass, for example, on a moving endless grid, including a mass-forming forming and squeezing device, characterized in that, in order to intensify the dehydration of the web and to reduce the size of the grid part, the squeezing device is made in the form of a number installed in an inclined plane one above the other shafts, of which the shanks are suction and the upper shafts are connected to pneumatic diaphragms and levers; moreover, on both sides of the web between the upper shafts, water scrapers are installed, and between the lower ones - slotted suckers.

A-A

tzFig 2